Lesson 2 End - 2nd Sec

What is wrong with bohr model ?

• He failed to explain Helium atom

• Described the electron as a particle moving in a circular planar orbit

• Determination both of the location and speed of an electron at the same time.

• the electron as a negative charged particle with its wave properties.

which atom bohr couldn't make atomic spectrum for it

• ₁H

• ₂He⁺

• ₃Li⁺²

• ₄Be⁺²

Acc. To Dual Nature of Electron.... what is wrong in the following sentence

• If a sufficient beam of electrons hit a small paper fan it will rotate

• each electron has a specific wavelenght and frequency

• electron has position and dimension

• you can consider the electron as wave particle only

we can't detect the location and the speed of electron acc. to Hesinberg due to

• the electron wave motion doesn't have a certain location.

• the electron has dual nature.

• electron is -ve charged particle only

Electron cloud is a region of

• High Probability of finding electron

• Probable of finding elecctron

• No Probability of finding electron

Orbital is a region of

• High Probability of finding electron

• No Probability of finding electron

• Probable of finding electron

on solving Schoridinger equation ?

• Determine the allowed energy levels.

• Define the regions of space around the nucleus, where it is most probable to find the electron in each energy level.

• changed our concept about the movement of electron ... we can said electron cloud instead of orbit .

Schrödinger used the idea of

• Max plank

• Albert enistien

• De brogile

• Hesinberg

• all the following

which model is the modern model

• 
• 
• 
• 

Which of these is a correct description of an atom?

• An atom is a solid object and the smallest part of any material.

• An atom is mostly space, with protons and electrons chasing each other around in orbits.

• An atom is mostly space, with electrons orbiting a single nucleus containing protons and neutrons.

• An atom is just a cloud of energy, containing no matter.